CODAG-electric
Another way to combine the two types of engines is to connect them to generators and drive the propellers electrically as in a diesel-electric (See CODLAG, Combined Diesel-Electric and Gas). The RMS Queen Mary 2 uses this design. This also permits propeller pods with the propulsion motors inside the pods. A further CODAG innovation on the QM2 is to mount the turbines not in the engine room but directly under the funnel, simplifying the fresh air supply.
Read more about this topic: Combined Diesel And Gas